Finding the Third Proportional to 142,890 and 209,907

Step by Step Solution

1. Step 1: Write the proportion equation
   142,890 : 209,907 = 209,907 : x
2. Step 2: Convert to fraction form
   142,890/209,907 = 209,907/x
3. Step 3: Cross multiply
   142,890x = 209,907 × 209,907
4. Step 4: Simplify right side
   142,890x = 44,060,948,649
5. Step 5: Solve for x
   x = 44,060,948,649/142,890
6. Step 6: Final answer
   x = 308,355.72